72 68 81 93 56 19 78 94 83 84 77 69 85 97 75 71 86 47 66 27 (i) Use a calculator with sample mean and standard deviation keys to find x and s. (Round your answers to two decimal places.) x = yr s = yr
Solution : Given that 72,68,81,93,56,19,78,94,83,84,77,69,85,97,75,71,86,47,66,27
sample mean = sum of terms/number of terms
= 1428/20
= 71.40
Sample standard deviation = 20.6484 = 20.65 (rounded)
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